Use the absolute path of a file when doing a symlink.
Use the absolute path of a file when doing a symlink.

TBR=scottmg@chromium.org
BUG=419322

Review URL: https://codereview.chromium.org/629433003

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@292321 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build